Self-descaling metal hard-seal ball valve

Abstract

This utility model provides a self-descaling metal hard-seal ball valve, belonging to the field of ball valve technology. It includes a ball valve body, a ball valve ball inside the ball valve body, a ball valve opening / closing stem on the upper part of the ball valve ball, a valve stem key pin on the lower part of the ball valve opening / closing stem, a ball valve switch knob above an elastic retaining ring, an anti-reverse ratchet mechanism below the ball valve switch knob, and a self-descaling mechanism on the outer surface of the ball valve ball. This device uses the ball valve body as the main body, with a ball valve ball containing a ball through-hole inside. Opening and closing control is achieved through the ball valve opening / closing stem. The anti-reverse ratchet mechanism prevents accidental valve reversal and offset. The self-descaling mechanism on the outer side of the ball valve ball dynamically scrapes away scale during opening and closing, and is combined with a self-descaling blade holder adjustment mechanism to achieve adaptive adjustment of the descaling gap. This utility model can automatically clean scale, prevent reversal, adapt to complex working conditions, operate stably, and has low maintenance costs, demonstrating strong practicality and adaptability.

Description

Technical Field

[0001] This utility model relates to the field of ball valves, and more specifically, to a self-descaling metal hard-seal ball valve. Background Technology

[0002] Metal hard-seal ball valves are widely used in industrial media transportation pipeline systems such as chemical, petroleum, heating, and municipal water supply and drainage due to their high temperature resistance, high pressure resistance, and excellent sealing performance. They mainly rely on the metal hard-seal surface of the ball to achieve the on-off control and sealing cut-off of the pipeline media.

[0003] The ball valve proposed in application number CN222950464U includes a valve body with a flow channel for fluid passage. A ball for controlling the flow channel's cut-off is disposed within the flow channel. An actuator connected to the ball and controlling its rotation is mounted on the valve body. An adjusting frame is disposed within the flow channel, and a filter element, including a filter screen, is mounted on the adjusting frame. A first fluid segment and a second fluid segment with different inner diameters are formed within the flow channel. The adjusting frame is located at the junction of the first and second fluid segments. This invention has the following advantages and effects: by clamping the filter screen into the flow channel and fixing it at the junction of the first and second fluid segments, the filter element can withstand fluid impact and remain stable.

[0004] However, existing ball valves have some shortcomings that need to be improved during use. First, industrial media generally contain substances such as mud, minerals, and colloidal impurities. When the media flows over the surface of the ball valve ball for a long time, it is easy to form crystal scale and dirt accumulation. Traditional ball valves do not have self-descaling function. After the scale accumulates and hardens over a long period of time, it will directly cause poor sealing of the ball sealing surface, valve opening and closing jamming, and ultimately lead to problems such as media leakage and valve failure. Frequent shutdowns and disassembly for manual descaling and maintenance are required, which results in high maintenance costs, large downtime losses, and seriously affects the continuous production operation of pipelines.

[0005] Secondly, most existing ball valves lack anti-reverse limiting structures. Under the impact of high-pressure media, pipeline vibration, and accidental contact by external forces, the valve stem is prone to reverse rotation and opening deviation, leading to loose valve seals, micro-leakage, poor operational stability, and significant safety hazards. Furthermore, traditional ball valves often have fixed descaling structures, which cannot adjust the gap according to scale thickness and blade wear. Over time, the descaling gap widens, the descaling effect significantly diminishes, and adaptability is poor. Therefore, a self-descaling metal hard-seal ball valve is proposed. Utility Model Content

[0006] The purpose of this utility model is to address the problems raised in the existing background technology. To achieve the above-mentioned utility model objective, this utility model provides the following technical solution: a self-descaling metal hard-seal ball valve, including a ball valve body, a ball valve ball disposed inside the ball valve body, a ball valve opening and closing valve stem disposed on the upper part of the ball valve ball, a valve stem key pin disposed on the lower part of the ball valve opening and closing valve stem, a valve stem chamfered surface disposed on the upper side of the ball valve opening and closing valve stem, an elastic retaining ring disposed above the ball valve opening and closing valve stem, a ball valve switch knob disposed above the elastic retaining ring, an anti-reverse ratchet mechanism disposed below the ball valve switch knob, and a self-descaling mechanism disposed on the outer surface of the ball valve ball.

[0007] As a preferred technical solution of this utility model, the ball valve body has a ball through hole and the upper part of the ball valve body is provided with a ball keyway.

[0008] As a preferred technical solution of this utility model, the anti-reverse ratchet mechanism includes a ratchet frame, a ratchet disc, a ratchet gear ring, and a check block.

[0009] As a preferred technical solution of this utility model, a ratchet disc is provided below the ratchet frame, the ratchet disc cooperates with the ratchet gear ring, and a check stop block is provided on the ratchet gear ring.

[0010] As a preferred technical solution of this utility model, a valve body cavity sealing sleeve is provided inside the ball valve housing, a valve body sealing ring is provided at the end of the valve body cavity sealing sleeve, and a valve body connecting pipe is provided on the side of the valve body sealing ring.

[0011] As a preferred technical solution of this utility model, a pipe wear-resistant sleeve is provided on the left side of the ball valve body, a sealing surface groove ring is provided on the side of the pipe wear-resistant sleeve, a pipe expansion compensation ring is provided on the side of the sealing surface groove ring, and valve body threaded joints are provided on both sides of the ball valve body, and the valve body threaded joints are engaged with threaded caps.

[0012] As a preferred technical solution of this utility model, the self-descaling mechanism includes a self-descaling scraper ring, a self-descaling scraper blade, and a descaling guide groove.

[0013] As a preferred technical solution of this utility model, the lower part of the self-descaling scraper ring is provided with a self-descaling scraper blade, and the self-descaling scraper ring is provided with a scale removal guide groove.

[0014] As a preferred technical solution of this utility model, it also includes a self-descaling tool holder adjustment mechanism, which includes a self-descaling tool holder body, a self-descaling tool holder adjustment keyway, a self-descaling tool holder seat, an adjustment screw, and an adjustment thread knob.

[0015] As a preferred technical solution of this utility model, the self-descaling knife holder body has self-descaling knife holder adjustment keyways on both sides, the self-descaling knife holder adjustment keyways are inserted into the self-descaling knife holder base, and the self-descaling knife holder base is provided with an adjustment thread knob, the adjustment thread knob cooperates with the adjustment screw.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This invention integrates a self-descaling scraper ring and a self-descaling scraper blade on the surface of the ball valve body. It can scrape away scale, impurities, and media crystals on the ball surface in real time by utilizing the rotational action of the valve opening and closing. Combined with the descaling guide groove, it facilitates the discharge of dirt, eliminating the need for manual disassembly and cleaning, significantly reducing equipment downtime for maintenance, lowering operating costs, and ensuring continuous and stable pipeline operation. Through the unidirectional limiting action of the ratchet frame, ratchet disc, ratchet gear ring, and check block, the opening and closing positions of the ball valve stem and ball body can be effectively locked, preventing problems such as reverse loosening, opening deviation, and micro-leakage caused by media impact, pipeline vibration, or accidental external force contact, greatly improving the safety and stability of equipment operation.

[0017] By adjusting the threaded knob and the threaded transmission structure of the adjusting screw, in conjunction with the sliding guide of the self-descaling tool holder adjusting keyway, the contact gap between the descaling structure and the ball surface can be adjusted, improving the adaptability of the equipment to operating conditions. A double-layer sealing protection is formed by the valve body cavity sealing sleeve and the valve body sealing ring, combined with a pipe wear-resistant sleeve to resist high-speed erosion and wear by the media, extending the valve body's lifespan. The ball valve body adopts a structure with a threaded joint and threaded cap, making disassembly and assembly convenient and facilitating equipment maintenance and replacement. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the ball structure of the ball valve provided by this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the anti-reverse stop block structure provided by this utility model;

[0022] Figure 5 This is a schematic diagram of the anti-reverse ratchet mechanism provided by this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the self-descaling scraper blade provided by this utility model;

[0024] Figure 7 A schematic diagram of the adjusting thread knob structure provided by this utility model;

[0025] Figure 8This is a schematic diagram of the self-descaling mechanism provided by this utility model;

[0026] Figure 9 A schematic diagram of the self-descaling knife holder adjustment mechanism provided by this utility model.

[0027] The image shows:

[0028] 1. Ball valve body; 2. Ball valve ball; 201. Ball through hole; 202. Ball keyway; 3. Ball valve stem for opening and closing; 4. Stem key pin; 5. Stem cut surface; 6. Elastic retaining ring; 7. Ball valve switch knob; 8. Anti-reverse ratchet mechanism; 801. Ratchet carrier; 802. Ratchet disc; 803. Ratchet gear ring; 804. Check block; 9. Valve body cavity sealing sleeve; 10. Valve body sealing ring; 11. Valve body connecting pipe; 12. Sealing surface groove ring; 3. Pipe wear-resistant sleeve; 14. Pipe expansion compensation ring; 15. Valve body threaded joint; 16. Threaded cap; 17. Self-descaling mechanism; 1701. Self-descaling scraper ring; 1702. Self-descaling scraper blade; 1703. Descaling guide groove; 18. Self-descaling blade holder adjustment mechanism; 1801. Self-descaling blade holder body; 1802. Self-descaling blade holder adjustment keyway; 1803. Self-descaling blade holder seat; 1804. Adjusting screw; 1805. Adjusting thread knob. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are one specific implementation of this utility model and are not limited to all embodiments.

[0030] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of this utility model can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] Example 1: A self-descaling metal hard-seal ball valve includes a ball valve body 1, a ball valve ball 2 disposed inside the ball valve body 1, a ball valve opening / closing stem 3 disposed on the upper part of the ball valve ball 2, a stem key pin 4 disposed on the lower part of the ball valve opening / closing stem 3, a stem chamfered surface 5 disposed on the upper side of the ball valve opening / closing stem 3, an elastic retaining ring 6 disposed above the ball valve opening / closing stem 3, a ball valve switch knob 7 disposed above the elastic retaining ring 6, an anti-reverse ratchet mechanism 8 disposed below the ball valve switch knob 7, and a self-descaling mechanism 17 disposed on the outer surface of the ball valve ball 2.

[0033] The ball valve body 2 has a ball through hole 201 and a ball keyway 202 is provided on the upper part of the ball valve body 2.

[0034] The anti-reverse ratchet mechanism 8 includes a ratchet carrier 801, a ratchet disc 802, a ratchet gear ring 803, and a check stop block 804.

[0035] A ratchet disc 802 is provided below the ratchet carrier 801. The ratchet disc 802 cooperates with the ratchet gear ring 803, and a check stop 804 is provided on the ratchet gear ring 803. A valve body cavity sealing sleeve 9 is provided inside the ball valve housing 1. A valve body sealing ring 10 is provided at the end of the valve body cavity sealing sleeve 9, and a valve body connecting pipe 11 is provided on the side of the valve body sealing ring 10.

[0036] A pipe wear-resistant sleeve 13 is provided on the left side of the ball valve body 1. A sealing surface groove ring 12 is provided on the side of the pipe wear-resistant sleeve 13. A pipe expansion compensation ring 14 is provided on the side of the sealing surface groove ring 12. A valve body threaded joint 15 is provided on both sides of the ball valve body 1. The valve body threaded joint 15 mates with a threaded cap 16. The self-descaling mechanism 17 includes a self-descaling scraper ring 1701, a self-descaling scraper blade 1702, and a descaling guide groove 1703.

[0037] The lower part of the self-descaling scraper ring 1701 is provided with a self-descaling scraper blade 1702, and the self-descaling scraper ring 1701 is provided with a descaling guide groove 1703. The self-descaling blade holder adjustment mechanism 18 includes a self-descaling blade holder body 1801, a self-descaling blade holder adjustment keyway 1802, a self-descaling blade holder seat 1803, an adjustment screw 1804, and an adjustment screw knob 1805. The self-descaling blade holder body 1801 is provided with self-descaling blade holder adjustment keyways 1802 on both sides, and the self-descaling blade holder adjustment keyways 1802 are inserted into the self-descaling blade holder seat 1803. The self-descaling blade holder seat 1803 is provided with an adjustment screw knob 1805, and the adjustment screw knob 1805 cooperates with the adjustment screw 1804.

[0038] The ball valve ball 2 has a through-hole 201 inside, which serves as a medium flow channel. By rotating the ball valve ball 2, the overlap between the through-hole 201 and the valve body channel can be changed, thereby enabling the ball valve to open, close, and regulate flow. A keyway 202 is pre-installed on the upper part of the ball valve ball 2 for precise assembly with the valve stem structure, facilitating power transmission.

[0039] The ball valve stem 3 serves as the power transmission component for opening and closing. Its lower stem key pin 4 engages with the ball valve ball 2's keyway 202, achieving synchronous transmission between the stem and the ball. When the operator rotates the ball valve switch knob 7, power is transmitted through the ball valve stem 3 to the ball valve ball 2, driving it to rotate and completing the valve opening and closing operation. The stem chamfered surface 5 on the upper side of the ball valve stem 3 serves as a limiting and foolproof assembly feature, ensuring precise alignment between the knob and the stem. The elastic retaining ring 6, mounted on the upper part of the ball valve stem 3, axially limits the ball valve switch knob 7, preventing loosening or detachment during operation and ensuring the stability of the opening and closing transmission structure.

[0040] The anti-reverse ratchet mechanism 8, mounted below the ball valve switch knob 7, is used to limit reverse operation during the opening and closing of the ball valve, lock the valve's open and closed state, and prevent the valve from loosening or failing to open and close. The ratchet frame 801 is a fixed support base, and the ratchet disc 802 mounted below the ratchet frame 801 rotates synchronously with the ball valve stem 3. The ratchet disc 802 meshes with the ratchet gear ring 803, and the unidirectional transmission limit is achieved through the meshing of the teeth.

[0041] The check stop 804 mounted on the ratchet gear ring 803 is the core limiting component. It can stop the reverse rotation tendency of the ratchet gear ring 803 and only allow the ratchet disc 802 to rotate in one direction. This restricts the reverse movement of the ball valve switch knob 7 and the ball valve opening and closing valve stem 3, effectively preventing the valve from reversing and loosening under the impact of medium pressure or accidental contact by external force, ensuring the stability of the valve opening and closing state, and improving the safety of equipment operation.

[0042] The self-descaling mechanism 17 mounted on the outer surface of the ball valve body 2 can automatically clean scale, impurities, and dirt from the ball surface during the valve's opening, closing, and rotation, preventing scale buildup from causing poor valve sealing and jamming during opening and closing. The self-descaling scraper ring 1701 serves as the main descaling support, surrounding and fitting snugly against the outer surface of the ball valve body 2, with its lower fixed self-descaling scraper blade 1702 in close contact with the ball surface.

[0043] During the rotational opening and closing of the ball valve ball 2, the ball and the self-descaling scraper blade 1702 move relative to each other. The blade can scrape off scale, impurities, media crystals and other dirt attached to the surface of the ball in real time. At the same time, the scale removal guide groove 1703 opened on the self-descaling scraper ring 1701 can guide the scraped dirt to flow out of the valve body with the medium water flow, so as to avoid the accumulation of dirt in the gap between the descaling structure and the ball, ensure the continuous and effective descaling effect, and maintain the surface smoothness and sealing accuracy of the ball valve ball 2.

[0044] The self-descaling blade holder adjustment mechanism 18 is used to precisely adjust the contact gap between the self-descaling mechanism 17 and the ball valve ball 2, adapting to different scale thicknesses and descaling requirements under different working conditions, while compensating for blade wear gaps to ensure long-term descaling effect. The self-descaling blade holder base 1803 is a fixed base, and the self-descaling blade holder body 1801 is assembled with the blade holder base through the self-descaling blade holder adjustment keyways 1802 on both sides, which can realize lateral sliding adjustment.

[0045] The operator rotates the adjusting screw knob 1805 on the self-descaling blade holder 1803, which drives the matching adjusting screw 1804 to rotate. Through the screw drive, the self-descaling blade holder 1801 is displaced along the adjusting keyway, precisely adjusting the tightness of the fit between the self-descaling scraper ring 1701, the self-descaling scraper blade 1702, and the ball valve ball 2. When the blade shows slight wear or the scale layer on the ball surface thickens, the gap can be reduced by adjusting the structure to ensure a tight fit between the blade and the ball surface, continuously and efficiently completing the descaling operation, and significantly improving the adaptability and service life of the equipment.

[0046] During operation, the ball valve opening / closing knob 7 drives the ball valve stem 3 to rotate, which in turn rotates the ball valve body 2. The ball's through-hole 201 controls the flow of media. An anti-reverse ratchet mechanism 8 locks the valve's open / closed state in real time to prevent accidental reversal. The multi-layered sealing structure inside the valve body and its pipe-fitting structure ensure the equipment's sealing performance and the stability of its pipe fit. During each valve opening / closing rotation, the self-descaling mechanism 17 simultaneously performs descaling on the ball's surface. The self-descaling tool holder adjustment mechanism 18 can also adjust the descaling gap in real time, achieving integrated operation of valve opening / closing, sealing protection, anti-misoperation, and automatic descaling.

[0047] Working process: During the equipment installation phase, the ball valve body 1 is locked by the threaded joints 15 and threaded caps 16 on both sides of the valve body to complete the sealing assembly with the external pipeline; the valve body connecting pipe 11 connects to the medium pipeline, and together with the valve body cavity sealing sleeve 9 and the valve body sealing ring 10, it forms a multiple sealing barrier inside the valve body. At the same time, the pipeline wear-resistant sleeve 13, the sealing surface groove ring 12 and the pipeline expansion compensation ring 14 work together to offset the deformation stress caused by the thermal expansion and contraction of the pipeline, and avoid sealing leakage problems caused by pipeline vibration and deformation. After the equipment is assembled, it enters the standby state.

[0048] When the valve is opened, the operator rotates the ball valve switch knob 7 clockwise. The ball valve switch knob 7, under the axial limiting protection of the elastic retaining ring 6, transmits power stably, causing the ball valve opening / closing stem 3 to rotate synchronously. The ball valve opening / closing stem 3 relies on the lower stem key pin 4 to engage with the upper ball keyway 202 of the ball valve body 2, precisely driving the ball valve body 2 to rotate inside the ball valve housing 1. This causes the ball through-hole 201 to gradually align with the valve body flow channel, allowing the medium to flow smoothly through the valve body connecting pipe 11 and the ball through-hole 201, thus achieving pipeline medium conduction. During this process, the valve stem chamfered surface 5 serves to prevent assembly errors and limit rotation, ensuring accurate valve stem transmission angle and preventing excessive opening / closing deviation.

[0049] While the valve rotates in the forward direction, the anti-reverse ratchet mechanism 8 simultaneously engages to limit the movement. The ratchet frame 801 remains stationary, and the ratchet disc 802 rotates synchronously in the forward direction with the ball valve stem 3, engaging with the ratchet gear ring 803 in one direction. The check block 804 is in a released and avoidance state, which does not affect the normal opening and closing of the valve. When the valve is adjusted to the specified opening degree, the ball valve switch knob 7 is stopped. The medium pressure and pipeline vibration can easily cause the valve stem to have a reverse rotation tendency. At this time, the check block 804 quickly clamps the tooth groove of the ratchet gear ring 803, locking the reverse rotation degree of freedom of the ratchet disc 802, thereby locking the position of the ball valve stem 3 and the ball valve ball 2, preventing the valve from reversing on its own and the opening degree from deviating, and ensuring stable operation.

[0050] When the equipment operates in continuous flow, impurities, scale, and crystalline substances in the medium easily adhere to the surface of the ball valve ball 2. At this time, the self-descaling mechanism 17 continuously performs dynamic descaling operations as the ball rotates. Each time the ball valve ball 2 rotates to open or close, it slides relative to the self-descaling scraper blade 1702. The self-descaling scraper blade 1702 closely adheres to the surface of the ball, scraping away the attached dirt and impurities in real time. The scraped dirt debris is quickly guided through the descaling guide groove 1703 on the self-descaling scraper ring 1701 and carried out of the valve body with the medium water flow. This effectively prevents dirt from accumulating in the gap between the ball sealing surface and the valve body, preventing problems such as sealing failure and opening / closing jamming caused by scale hardening, and continuously ensuring the metal hard seal accuracy of the ball valve ball 2.

[0051] To address changes in operating conditions such as wear of the self-descaling scraper blade 1702 and thickening of the scale layer after long-term use, the descaling gap can be finely adjusted in real time via the self-descaling blade holder adjustment mechanism 18. Rotating the adjusting screw knob 1805 drives the adjusting screw 1804 to generate threaded transmission, causing the self-descaling blade holder body 1801 to slide smoothly along the self-descaling blade holder seat 1803 through the self-descaling blade holder adjustment keyway 1802. This precisely adjusts the contact gap between the self-descaling scraper ring 1701 and the ball valve ball 2, compensating for the blade wear gap and ensuring that the self-descaling scraper blade 1702 is always in close contact with the ball surface, maintaining continuous and efficient self-descaling capability.

[0052] When the valve is closed, the ball valve switch knob 7 is rotated in the reverse direction to drive the ball 2 of the ball valve to rotate, so that the ball through hole 201 is completely misaligned with the flow channel of the valve body, blocking the flow of the medium. After closing, the anti-reverse ratchet mechanism 8 locks the valve stem position again to prevent the valve from being impacted by the medium and causing micro-leakage or loosening. With the multiple sealing structure of the valve body cavity sealing sleeve 9 and the valve body sealing ring 10, the valve is completely sealed and the flow is cut off, completing one complete working cycle.

[0053] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A self-descaling metal hard-seal ball valve, comprising a ball valve body (1), characterized in that, The ball valve body (1) is provided with a ball valve ball (2), the upper part of the ball valve ball (2) is provided with a ball valve opening and closing valve stem (3), the lower part of the ball valve opening and closing valve stem (3) is provided with a valve stem key pin (4), the upper side of the ball valve opening and closing valve stem (3) is provided with a valve stem cutting surface (5), the upper part of the ball valve opening and closing valve stem (3) is provided with an elastic retaining ring (6), the upper part of the elastic retaining ring (6) is provided with a ball valve switch knob (7), the lower part of the ball valve switch knob (7) is provided with an anti-reverse ratchet mechanism (8), and the outer surface of the ball valve ball (2) is provided with a self-descaling mechanism (17).

2. The self-descaling metal hard-seal ball valve according to claim 1, characterized in that, The ball valve body (2) has a ball through hole (201) and the upper part of the ball valve body (2) is provided with a ball keyway (202).

3. The self-descaling metal hard-seal ball valve according to claim 2, characterized in that, The anti-reverse ratchet mechanism (8) includes a ratchet frame (801), a ratchet disc (802), a ratchet gear ring (803), and a check stop block (804).

4. The self-descaling metal hard-seal ball valve according to claim 3, characterized in that, A ratchet disc (802) is provided below the ratchet frame (801), the ratchet disc (802) cooperates with the ratchet gear ring (803), and a check stop block (804) is provided on the ratchet gear ring (803).

5. The self-descaling metal hard-seal ball valve according to claim 4, characterized in that, The ball valve housing (1) is provided with a valve body cavity sealing sleeve (9), the end of the valve body cavity sealing sleeve (9) is provided with a valve body sealing ring (10), and the side of the valve body sealing ring (10) is provided with a valve body connecting pipe (11).

6. The self-descaling metal hard-seal ball valve according to claim 5, characterized in that, The ball valve body (1) is provided with a pipe wear-resistant sleeve (13) on the left side, a sealing surface groove ring (12) is provided on the side of the pipe wear-resistant sleeve (13), a pipe expansion compensation ring (14) is provided on the side of the sealing surface groove ring (12), and a valve body threaded joint (15) is provided on both sides of the ball valve body (1), and the valve body threaded joint (15) is engaged with a threaded cap (16).

7. The self-descaling metal hard-seal ball valve according to claim 6, characterized in that, The self-descaling mechanism (17) includes a self-descaling scraper ring (1701), a self-descaling scraper blade (1702), and a descaling guide groove (1703).

8. The self-descaling metal hard-seal ball valve according to claim 7, characterized in that, The lower part of the self-descaling scraper ring (1701) is provided with a self-descaling scraper blade (1702), and the self-descaling scraper ring (1701) is provided with a descaling guide groove (1703).

9. The self-descaling metal hard-seal ball valve according to claim 8, characterized in that, It also includes a self-descaling tool holder adjustment mechanism (18), which includes a self-descaling tool holder body (1801), a self-descaling tool holder adjustment keyway (1802), a self-descaling tool holder seat (1803), an adjustment screw (1804), and an adjustment thread knob (1805).

10. The self-descaling metal hard-seal ball valve according to claim 9, characterized in that, The self-descaling knife holder body (1801) has self-descaling knife holder adjustment keyways (1802) on both sides. The self-descaling knife holder adjustment keyways (1802) are inserted into the self-descaling knife holder seat (1803). The self-descaling knife holder seat (1803) is provided with an adjustment thread knob (1805), which cooperates with the adjustment screw (1804).

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